Photophobia (Light Sensitivity): The Complete Guide

What Is Photophobia?

Photophobia — commonly known as light sensitivity — is a condition where normal levels of light cause discomfort, pain, or the need to squint or close the eyes. Despite its name (which literally translates to “fear of light”), photophobia is not a phobia but rather a neurological symptom experienced in response to light.

Photophobia is not a disease itself. It is a symptom that can be associated with over 30 medical conditions, from common ones like migraines to less frequent conditions like meningitis.

How Common Is Photophobia?

Light sensitivity is extremely prevalent:

• Affects an estimated 17% of the general population to some degree
• Up to 80–90% of migraine sufferers experience photophobia during attacks
• More common in people with lighter-colored eyes
• Can occur at any age, though certain causes are more common in specific age groups

What Causes Photophobia?

Light sensitivity can result from many underlying conditions and factors:

Neurological Causes

• Migraines — the most common cause of recurring photophobia
• Concussions and TBI — light sensitivity often persists for weeks or months
• Meningitis — photophobia is a classic symptom
• View all conditions that cause light sensitivity →

Eye-Related Causes

• Dry eye syndrome — irritated corneal surface increases light sensitivity
• Corneal abrasions — scratches on the cornea cause acute photophobia
• Uveitis and iritis — inflammation inside the eye
• Learn more about eyes and light sensitivity →

Medication-Related

• Over 100 medications can cause photosensitivity as a side effect
• Common culprits include doxycycline, certain SSRIs, and retinoids
• Browse drug-induced photosensitivity →

Other Factors

• Eye color — lighter eyes are more sensitive due to less melanin
• Age — children and elderly may be more susceptible
• Mental health — anxiety and depression can amplify light sensitivity
• Read about causes of light sensitivity →

Symptoms of Photophobia

Light sensitivity typically presents with:

• Eye discomfort or pain in normal lighting conditions
• Squinting or closing eyes involuntarily
• Headache triggered or worsened by light exposure
• Tearing (excessive watering of the eyes)
• Brow ache from constant squinting
• Nausea in severe cases

Read the full guide to light sensitivity symptoms →

How Is Photophobia Diagnosed?

Diagnosis typically involves:

1. Medical history — when symptoms started, triggers, associated conditions
2. Eye examination — checking for corneal damage, inflammation, or dryness
3. Neurological evaluation — if migraines, concussion, or other neurological causes are suspected
4. Pupil response testing — assessing how pupils react to light

There is no single “photophobia test” — diagnosis focuses on identifying the underlying cause.

Treatment Options

Treatment depends on the underlying cause, but common approaches include:

Eyewear

• FL-41 tinted lenses — clinically studied for photophobia relief
• Blue light glasses — may help with screen-related sensitivity
• Sunglasses — essential for outdoor protection (but avoid wearing indoors, as this can worsen sensitivity over time)
• Compare light sensitivity glasses →

Medical Treatments

• Eye drops — lubricating drops for dry-eye-related photophobia
• Medications — treating the underlying condition (e.g., migraine preventives)
• Green light therapy — emerging treatment showing promise for migraine-related photophobia
• Explore all treatments →

Lifestyle Modifications

• Adjusting screen brightness and using night mode
• Using appropriate indoor lighting
• Taking regular breaks from screens (20-20-20 rule)
• Living with light sensitivity →

When to See a Doctor

Seek medical attention if your light sensitivity is:

• Sudden and severe — could indicate meningitis or acute eye condition
• Accompanied by vision changes — flashes, floaters, or loss of vision
• Persistent — lasting more than a few days without clear cause
• Associated with severe headache, stiff neck, or fever — medical emergency
• Significantly impacting daily activities

Photophobia vs. Photosensitivity

These terms are often confused:

• Photophobia — eye discomfort or pain in response to light (neurological/ocular symptom)
• Photosensitivity — abnormal skin reaction to sunlight (dermatological condition)
• Both can coexist, especially with conditions like lupus

Learn more about medical terminology →

Sources

1. Digre KB, Brennan KC. “Shedding light on photophobia.” Journal of Neuro-Ophthalmology. 2012;32(1):68-81.
2. Noseda R, et al. “A neural mechanism for exacerbation of headache by light.” Nature Neuroscience. 2010;13(2):239-245.
3. Katz BJ, Digre KB. “Diagnosis, pathophysiology, and treatment of photophobia.” Survey of Ophthalmology. 2016;61(4):466-477.